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OK
C.Fn III-4 option 1: Continuous AF tracking priority will suppress the
likelihood of focus shifting to the foreground
Countermeasures for obstructions in the foreground
Shooting with C.Fn III-4 Tracking Method
Option 1: Continuous AF tracking priority
Continuous focus on the subject was made possible
Shooting the same scene with C.Fn
III-4-1 keeps the focus on the main
subject instead of the obstruction.
As objects cut in front of the primary subject will be viewed as obstructions, mistakes with focus on the
obstructions can be avoided.
EF300mm f/2.8L IS USM 1/1600 sec. f/5.6 ISO100
Similar to when focus shifts to the background, a common error that
occurs when shooting moving subjects with AI Servo AF is when focus
shifts to obstructions in the foreground. The AF function basically
operates to focus as quickly as possible on subjects that the AF point is
covering, meaning that because the AF is so agile and high
performance it is difficult to avoid mistakes like this.
In Area expansion introduced on P 30, when shooting moving subjects,
an effective countermeasure for obstructions in the foreground is C.Fn
III-4 option 1: Continuous AF tracking priority. With this setting, when
another subject comes in front of the manually selected AF point it is
disregarded as an obstruction. Then, as the coordination of the
increased AF points captures the subject, the number of times focus
transfers to obstructions can be dramatically reduced.
Also, as with the case on P 30, using at the same time as one of the
slower options from C.Fn III-2 can be highly effective.
